Method of fabricating liquid crystal display

ABSTRACT

A first substrate and a second substrate are provided. An alignment process is performed on a surface of the first substrate and a surface of the second substrate respectively. A liquid crystal mixture is prepared, where the liquid crystal mixture includes a liquid crystal molecule and a liquid crystal monomer having a functional group of diacrylates, and the liquid crystal monomer having the functional group of diacrylates occupies 0.01-2 wt % of the liquid crystal mixture. The first substrate and the second substrate are assembled, and the liquid crystal mixture is filled therebetween. A polymerization curing process is performed such that the liquid crystal monomer having the functional group of diacrylates is polymerized to respectively form a liquid crystal polymer film on the aligned surfaces of the first and second substrates. The method enhances anchoring energy and reduces problems of V-T shift, surface gliding, and residual image.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional application of and claims the prioritybenefit of U.S. application Ser. No. 12/592,677, filed on Nov. 30, 2009,now allowed, which claims the priority benefit of Taiwan applicationserial no. 98136316, filed on Oct. 27, 2009. The entirety of each of theabove-mentioned patent applications is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND

1. Field of the Disclosure

The disclosure relates to a method of fabricating a display, and moreparticularly to a method of fabricating a liquid crystal display (LCD).

2. Description of Related Art

Along with the great advancement of computer performance and the rapiddevelopment of the Internet and multimedia technology, the volume ofvideo or image apparatus is getting smaller and lighter. In thedevelopment of displays, liquid crystal displays (LCDs) having suchadvantages as high image quality, high space efficiency, low powerconsumption, and free of radiation have become the major products indisplay market along with the advancement of photo-electronic techniquesand semiconductor fabricating techniques.

An LCD panel includes a backlight module and a LCD, and a conventionalLCD is composed of two substrates and a liquid crystal layer filledbetween the two substrates. Generally, during the fabricating process ofan LCD, alignment films are formed on both substrates so that liquidcrystal molecules are arranged in a particular arrangement. Aconventional method to arrange liquid crystal molecules is to perform analignment process to an alignment material after the alignment materialhas been coated over a substrate. The alignment process is categorizedinto contact alignment process and non-contact alignment process. Thenon-contact alignment process can resolve the problems such as staticproduced by contact rubbing alignment and particle contamination, but itexist the problem of insufficient anchoring energy of the alignmentsurface. Insufficient anchoring energy of an alignment surface usuallyresults in poor display quality of the LCD. Methods disclosed inpublications for solving insufficient anchoring energy in thenon-contact alignment process mostly include development of newmaterials for alignment films. However, the new materials developed areincapable of satisfying demands for mass production.

SUMMARY OF THE DISCLOSURE

A method of fabricating a liquid crystal display (LCD) is provided. Inthe method, a first substrate and a second substrate are provided. Next,an alignment process is performed respectively on a surface of the firstsubstrate and a surface of the second substrate. A liquid crystalmixture is then prepared. The liquid crystal mixture includes a liquidcrystal molecule and a liquid crystal monomer having a functional groupof diacrylates. The liquid crystal monomer having the functional groupof diacrylates occupies 0.01-2 wt % of the liquid crystal mixture. Thefirst substrate and the second substrate are assembled and the liquidcrystal mixture is filled therebetween. A polymerization curing processis performed so that the liquid crystal monomer having the functionalgroup of diacrylates in the liquid crystal mixture is polymerized torespectively form a liquid crystal polymer film on the aligned surfacesof the first substrate and the second substrate.

In order to make the aforementioned and other features of the disclosuremore comprehensible, embodiments accompanying figures are described indetail below.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the disclosure, and are incorporated in and constitutea part of this specification.

The drawings illustrate embodiments of the disclosure and, together withthe description, serve to explain the principles of the disclosure.

FIGS. 1A and 1B are schematic views of an alignment process according toan embodiment of the disclosure.

FIGS. 2 to 4 are schematic cross-sectional views illustrating afabrication flowchart following FIG. 1A or FIG. 1B.

FIGS. 5 to 8 are schematic cross-sectional views illustrating aflowchart of fabricating a liquid crystal display (LCD) according to asecond embodiment of the disclosure.

FIGS. 9A and 9B respectively show a schematic top view illustratingdevices of a first substrate and a second substrate of an LCD in an IPSmode.

FIGS. 10A and 10B are schematic cross-sectional views illustrating theLCD in the IPS mode.

FIG. 11 shows surface gliding of an LCD under a polarized microscope,where the LCD is fabricated by adopting a First Example and has beendriven for an hour under 40 Vpp.

FIG. 12 shows surface gliding of an LCD under a polarized microscope,where the LCD is fabricated by adopting a Second Example and has beendriven for an hour under 40 Vpp.

DESCRIPTION OF EMBODIMENTS First Embodiment

FIGS. 1A and 1B are schematic views of an alignment process according toan embodiment of the disclosure. FIGS. 2 to 4 are schematiccross-sectional views illustrating a fabrication flowchart followingFIG. 1A or FIG. 1B.

The present embodiment provides a method of fabricating a liquid crystaldisplay (LCD). Referring to FIG. 1A, a first substrate 101 and a secondsubstrate 201 are first provided. The first substrate 101, for example,is an active device array substrate or a passive matrix substrate. Thesecond substrate 201, for example, is a color filter substrate or acounter substrate. More specifically, the first substrate 101 isconstituted by a substrate 100 and a film 102 formed on the substrate100. The second substrate 201 is constituted by a substrate 200 and afilm 202 formed on the substrate 200. The substrates 100, 200 are glasssubstrates, silicon substrates, flexible plastic substrates, or othersubstrates known to be adopted in displays. When the display of thedisclosure is a passive display, the films 102 and 202 are each anelectrode layer, for instance. When the display of the disclosure is anactive display, the film 102 is then an active device array layer, forexample, and the film 202 is, for example, an electrode layer, a colorfilter array layer, or a combination thereof. The electrode layer is,for example, made of organic conductive material which includes, forinstance, poly(3,4-ethylene dioxythiophene), PEDOT, and so on, orinorganic conductive material which includes, for instance, indium tinoxide, indium zinc oxide, and so on. According to other embodiments ofthe disclosure, the films 102 and 202 not only can be theabove-mentioned conductive layer (electrode layer or active device arraylayer), a surface layer of each film 102 and each film 202 also can bean insulating layer. That is, an insulating layer is further covered onthe electrode layer or the active device array layer, for example. Theinsulating layer is a passivation layer, an overcoat layer, or aplanarization layer. The insulating layer is made of organic insulatingmaterial or inorganic insulating material, for instance.

Referring to FIG. 1A, an alignment process 110 a is respectivelyperformed on a surface of the first substrate 101 and a surface of thesecond substrate 201. In details, the alignment process is performed onthe film 102 on the surface of the first substrate 100 and the film 202on the surface of the second substrate 201. In the embodiment of FIG.1A, the alignment process 110 a is a contact alignment process, such asa rubbing alignment process, a nano imprinting process, or an atomicforce microscopy probe contact alignment process.

However, according to another embodiment of the disclosure, thealignment process can also adopt a non-contact alignment process 110 b,as shown in FIG. 1B. The non-contact alignment process 110 b includes aparticle beam alignment process or a photo alignment process. Theparticle beam alignment process is, for example, an ion beam alignmentprocess, an electron beam alignment process, a plasma alignment process,or an oblique vapor deposition process. That is, the non-contactalignment is performed on the surfaces of the first substrate 101 andthe second substrate 201 by using ion beam, electron beam, plasma, oroblique vapor deposition. In addition, the photo alignment process is,for instance, a photo-polymerization alignment process, aphoto-decomposition alignment process, or a photo-isomerizationalignment process. In the foregoing photo alignment process, thesurfaces of the first substrate 101 and the second substrate 201 areilluminated to induce polymerization reaction, decomposition reaction,or isomerization reaction.

According to another embodiment, the alignment processes 110 a and 110 bcan be multi-domain alignment processes, namely, a multi-domainalignment process is performed on at least the surfaces of the firstsubstrate 101 and the second substrate 201. Thus, different domains onthe surfaces of the first substrate 101 and the second substrate 201have different alignment directions.

Next, referring to FIG. 2, a liquid crystal mixture 300 is prepared. Theliquid crystal mixture 300 includes a liquid crystal molecule 302 and aliquid crystal monomer 304 having a functional group of diacrylates.Moreover, the liquid crystal monomer 304 having the functional group ofdiacrylates occupies 0.01-2 wt % of the liquid crystal mixture 300. Inone embodiment, the liquid crystal monomer 304 having the functionalgroup of diacrylates preferably occupies 0.01-1 wt % of the liquidcrystal mixture 300. In another embodiment, the liquid crystal monomer304 having the functional group of diacrylates more preferably occupies0.25-1 wt % of the liquid crystal mixture 300. The liquid crystalmolecule 302, for instance, is a nematic liquid crystal molecule. Theliquid crystal monomer 304 having the functional group of diacrylates isa liquid crystal monomer having the functional group of diacrylateswhich is polymerized with a photo reaction or a thermal reaction. Inother words, the liquid crystal monomer 304 having the functional groupof diacrylates illustrated in the present embodiment means that theliquid crystal monomer having the functional group of diacrylates ispolymerized after irradiation or heating. Additionally, in oneembodiment, a method of preparing the liquid crystal mixture 300includes the following. The liquid crystal molecule 302 and the liquidcrystal monomer 304 having the functional group of diacrylates are mixedand heated to a liquid state for mixing evenly. According to anotherembodiment of the disclosure, a method of preparing the liquid crystalmixture 300 includes the following. The liquid crystal molecule 302 andthe liquid crystal monomer 304 having the functional group ofdiacrylates are first dissolved into a liquid state using a solvent.Then, the liquid crystal molecule 302 and the liquid crystal monomer 304having the functional group of diacrylates are mixed.

Thereafter, referring to FIG. 3, the first substrate 101 and the secondsubstrate 201 are assembled and the liquid crystal mixture 300 is filledtherebetween. Generally, this step adopts a sealant to adhere the twosubstrates 101, 201, and the liquid crystal mixture 300 is vacuuminjected between the two substrates 101, 201. Alternatively, a one dropfill technique is adopted to fill the liquid crystal mixture 300 betweenthe two substrates 101, 201.

A processing procedure is then performed, so that the liquid crystalmonomer 304 having the functional group of diacrylates in the liquidcrystal mixture 300 of FIG. 3 is polymerized to form a liquid crystalpolymer film 104 and a liquid crystal polymer film 204 respectively onthe aligned surface of the first substrate 101 and the aligned surfaceof the second substrate 201. The foregoing processing procedure includesan ultraviolet irradiation procedure or a heating procedure.

In the present embodiment, not only is the alignment process performedon the surfaces of the first substrate 101 and the second substrate 201,the liquid crystal polymer films 104, 204 as shown in FIG. 4 are furtherformed on the aligned surfaces of the first substrate 101 and the secondsubstrate 201. The liquid crystal polymer films 104, 204 are adopted asalignment auxiliary layers to improve insufficient anchoring energy ofthe LCD, thereby enhancing display quality of the LCD.

It should be noted that the fabrication method of the present embodimentis effective in enhancing anchoring energy of the LCD in an in-planeswitching (IPS) mode. Generally, devices of the first substrate 101 andthe second substrate 201 of the LCD in the so-called IPS mode arerespectively illustrated in FIGS. 9A and 9B. Moreover, a schematiccross-sectional view of the LCD in the IPS mode is shown in FIG. 10A.Referring to FIGS. 9A and 10A, the first substrate 101 includes aplurality of pixel units U, a plurality of data lines DL, and aplurality of scan lines SL. Each pixel unit U includes an active deviceT, a pixel electrode P, and a common electrode E. The active device Tincludes a gate G, a source S, a drain D, and a channel layer CH. Aninsulating layer 112 is covered on the gate G, and another insulatinglayer 114 is covered on the source S and the drain D. The gate G of theactive device T is electrically connected to the scan lines SL. Thesource S of the active device T is electrically connected to the datalines DL. Moreover, the drain D of the active device T is electricallyconnected to the pixel electrode P. The common electrode E and the pixelelectrode P within each pixel unit U are alternately disposed. Thecommon electrode E and the pixel electrode P are isolated by aninsulating layer 116. The common electrodes E within the pixel units Uare all electrically connected to a common voltage.

Referring to FIG. 9B and FIG. 10A, the second substrate 201 includes acolor filter array 214. The color filter array 214 includes red filterpatterns, green filter patterns, and blue filter patterns. Furthermore,a shielding pattern layer 212 is formed between the patterns of thecolor filter array 214, and the shielding pattern layer 212 is made ofmetal or black resin, for example. The common electrodes of the LCD inthe IPS mode are disposed on the first substrate 101. Thus, an electrodelayer is not disposed on the second substrate 201.

According to another embodiment of the disclosure, a schematiccross-sectional view of the LCD in the IPS mode is illustrated in FIG.10B. The embodiment in FIG. 10B and the embodiment in FIG. 10A aresimilar, thus the same components are denoted by the same numerals. Theembodiment in FIG. 10B and the embodiment in FIG. 10A are different inthat the common electrode E and the pixel electrode P are located on thesame film and isolated from each other. Consequently, the commonelectrode E and the pixel electrode P are electrically isolated.

It should be noted that the disclosure is not limited to be adopted inthe LCD in the IPS mode. According to other embodiments, the disclosureis also applied in a method of fabricating the LCD twist nematic (TN)LCD, super twist nematic (STN) LCD, vertical alignment (VA) LCD, or LCDsof other modes.

Second Embodiment

FIGS. 5 to 8 are schematic cross-sectional views illustrating aflowchart of fabricating an LCD according to a second embodiment of thedisclosure. Referring to FIG. 5, firstly, a first substrate 101 and asecond substrate 201 are provided. The first substrate 101 isconstituted by a substrate 100 and a film 102 formed on the substrate100. The second substrate 201 is constituted by a substrate 200 and afilm 202 formed on the substrate 200. The compositions and materials ofthe first and the second substrates 101, 201 are the same as thoseillustrated in the first embodiment, and thus not repeated herein.

Thereafter, a first alignment material layer 150 is formed on the film102 of the first substrate 101, and a second alignment material layer250 is formed on the film 202 of the second substrate 201. The first andthe second alignment material layers 150, 250 are each an organicalignment material or an inorganic alignment material. In oneembodiment, the organic alignment material includes poly vinyl alcohol,polyimide, polyamic acid, Azo-benzene, poly vinyl cinnamate, a compoundcontaining coumarin group, a compound containing chalcone groups, orother known organic alignment materials. The inorganic alignmentmaterial includes diamond-like carbon, SiO_(x), SiN_(x), or other knowninorganic alignment materials.

Next, a non-contact alignment process 110 b is performed to the firstand the second alignment material layers 150, 250. The non-contactalignment process 110 b is, for instance, a particle beam alignmentprocess or a photo alignment process. The particle alignment process is,for example, an ion beam alignment process, an electron beam alignmentprocess, a plasma alignment process, or an oblique vapor depositionprocess. Furthermore, the photo alignment process is, for instance, aphoto-polymerization alignment process, a photo-decomposition alignmentprocess, or a photo-isomerization alignment process. Similarly, thenon-contact alignment process 110 b can also be the multi-domainalignment process described above.

Referring to FIG. 6, a liquid crystal mixture 300 is prepared. Theliquid crystal mixture 300 includes a liquid crystal molecule 302 and aliquid crystal monomer 304 having a functional group of diacrylates.Moreover, the liquid crystal monomer 304 having the functional group ofdiacrylates occupies 0.01-2 wt % of the liquid crystal mixture 300. Inone embodiment, the liquid crystal monomer 304 having the functionalgroup of diacrylates preferably occupies 0.01-1 wt % of the liquidcrystal mixture 300. In another embodiment, the liquid crystal monomer304 having the functional group of diacrylates more preferably occupies0.25-1 wt % of the liquid crystal mixture 300. The liquid crystalmolecule 302, for instance, is a nematic liquid crystal molecule. Theliquid crystal monomer 304 having the functional group of diacrylates isa liquid crystal monomer having the functional group of diacrylateswhich is polymerized with a photo reaction or a thermal reaction. Inother words, the liquid crystal monomer 304 having the functional groupof diacrylates illustrated in the present embodiment means that theliquid crystal monomer having the functional groups of diacrylates ispolymerized after irradiation or heating. Additionally, in oneembodiment, a method of fabricating the liquid crystal mixture 300includes the following. The liquid crystal molecule 302 and the liquidcrystal monomer 304 having the functional group of diacrylates are mixedand heated to a liquid state for mixing evenly. According to anotherembodiment of the disclosure, a method of preparing the liquid crystalmixture 300 includes the following. The liquid crystal molecule 302 andthe liquid crystal monomer 304 having the functional group ofdiacrylates are first dissolved into a liquid state using a solvent.Then, the liquid crystal molecule 302 and the liquid crystal monomer 304having the functional group of diacrylates are mixed.

Afterwards, referring to FIG. 7, the first substrate 101 and the secondsubstrate 201 are assembled and the liquid crystal mixture 300 is filledtherebetween. Generally, this step adopts a sealant to adhere the twosubstrates 101, 201, and the liquid crystal mixture 300 is vacuuminjected between the two substrates 101, 201. Alternatively, a one dropfill technique is adopted to fill the liquid crystal mixture 300 betweenthe two substrates 101, 201.

Subsequently, a processing procedure is performed such that the liquidcrystal monomer 304 having the functional group of diacrylates in theliquid crystal mixture 300 in FIG. 7 is polymerized to form a liquidcrystal polymer film 104 on the first alignment material layer 150 ofthe first substrate 101 and a liquid crystal polymer film 204 on thesecond alignment material layer 250 of the second substrate 201. Theforegoing processing procedure includes an ultraviolet irradiationprocedure or a heating procedure.

Similarly, in the present embodiment, not only is the alignment processperformed on the first alignment material layer 150 and the secondalignment material layer 250, the liquid crystal polymer films 104, 204are further formed on the first alignment material layer 150 and thesecond alignment material layer 250. The liquid crystal polymer films104, 204 are adopted as alignment auxiliary layers of the firstalignment material layer 150 and the second alignment material layer 250to improve insufficient anchoring energy of the LCD, thereby enhancingdisplay quality thereof.

Also, the present embodiment is effective in enhancing anchoring energyof the LCD in the IPS mode. The LCD in the so-called IPS mode has beenillustrated above (as shown in FIGS. 9A, 9B, and 10), and is thus notrepeated herein. Likewise, the foregoing method is not limited to beapplied in the LCD in the IPS mode. According to other embodiments, theforegoing method is also applied in fabricating the LCD i TNLCD, STNLCD,VALCD, or LCDs of other modes.

Several embodiments are exemplified below to illustrate that the methodof the disclosure is capable of enhancing the anchoring energy of theLCD.

First Example

An LCD of the First Example is an LCD in an IPS mode, where the LCD isformed by using the method described in the First Embodiment. That is,after a rubbing alignment process is performed directly on surfaces ofthe first substrate and the second substrate (no alignment materiallayers are present on the first substrate and the second substrate), thetwo substrates are assembled and a liquid crystal mixture is filledtherebetween. Here, liquid crystal molecules in the adopted liquidcrystal mixtures are all ZOC-5084XX (manufactured by Chisso). However,liquid crystal monomers used are compared in the following threeexperiments. Among these, Experiment 1 applies a liquid crystal monomerRMM-256C having a functional group of diacrylates (manufactured byMerck), and Experiment 2 adopts a liquid crystal monomer RMM-491 havinga functional group of diacrylates (manufactured by Merck). However,Experiment 3 uses a liquid crystal monomer UCL-001 having a functionalgroup of acrylate (manufactured by DIC). The liquid crystal monomerhaving the functional group of diacrylates in the Experiments 1 and 2and the liquid crystal monomer having the functional group of acrylatein the Experiment 3 are irradiated by ultraviolet light (2 J/cm²) topolymerize, so that a liquid crystal polymer film is respectively formedon the aligned surfaces of the first and the second substrates.

FIG. 11 shows surface gliding of the LCD under a polarized microscope,where the LCD is fabricated by adopting the First Example and has beendriven for an hour under 40 Vpp. FIGS. 11( a) to 11(d) respectively showexperimental results in the Experiment 1 with concentrations of liquidcrystal monomers having the functional group of diacrylates being 0 wt%, 0.625 wt %, 1 wt %, and 2 wt % respectively. As shown in FIG. 11,under conditions of 0.625 wt % and 1 wt %, the LCDs show no surfacegliding. On the other hand, under conditions of 0 wt % and 2 wt %, theLCDs show surface gliding.

Table 1 lists the Experiments 1, 2, 3 and Comparative Example 1 with theLCD manufactured by adopting the method in the First Example. Theexperiment is performed by comparing the difference in V-T curvesmeasured before and after aging of the display. The condition of agingis to drive the LCD for an hour under 40 Vpp. From the result, it isshown that the liquid crystal polymer film is formed by the liquidcrystal monomer having the functional group of diacrylates added in theliquid crystal mixture after the ultraviolet irradiation process in theExperiment 1 and the Experiment 2. The liquid crystal polymer film iscapable of reducing the percentage of V-T shift. However, the liquidcrystal monomer having the functional group of acrylate adopted in theExperiment 3 increases the percentage of shift. It is thus shown thatthe liquid crystal monomer having the functional group of diacrylatescan reduce the percentage of V-T shift effectively.

TABLE 1 Percentage of Percentage of liquid crystal liquid crystalmonomer having monomer having Percentage the functional the functionalof group of diacrylates group of acrylate V-T shift Experiment 1 0.625wt % 0 wt % 0.011% Experiment 2 0.625 wt % 0 wt % 0.971% Experiment 3 0wt % 0.625 wt % 15.261% Comparative 0 wt % 0 wt % 6.430% Example 1

Second Example

An LCD of the Second Example is an LCD in an IPS mode, where the LCD isformed by using the method described in the Second Embodiment. That is,the first alignment material and the second alignment material arerespectively formed on the first substrate and the second substrate. Anon-contact alignment process is then performed. The two substrates areassembled subsequently, and the liquid crystal mixture is filledtherebetween. The foregoing non-contact alignment process adopts the ionbeam alignment process. Herein, liquid crystal molecules in the adoptedliquid crystal mixtures are all ZOC-5084XX (manufactured by Chisso).Nevertheless, liquid crystal monomers used are compared in the followingthree experiments. Among these, Experiment 4 applies a liquid crystalmonomer RMM-256C having a functional group of diacrylates (manufacturedby Merck), and Experiment 5 adopts a liquid crystal monomer RMM-491having a functional group of diacrylates (manufactured by Merck).However, Experiment 6 uses a liquid crystal monomer UCL-001 having afunctional group of acrylate (manufactured by DIC). Moreover, a materialof an alignment film is SE-7492 (manufactured by Nissan). The liquidcrystal monomer having the functional group of diacrylates in theExperiments 4 and 5 and the liquid crystal monomer having the functionalgroup of acrylate in the Experiment 6 are irradiated by ultravioletlight (2 J/cm²) to polymerize, so that a liquid crystal polymer film isrespectively formed on the first alignment material and the secondalignment material.

FIG. 12 shows surface gliding of the LCD under a polarized microscope,where the LCD is fabricated by adopting the Second Example and has beendriven for an hour under 40 Vpp. FIGS. 12( a) to 12(d) respectively showexperimental results in the Experiment 4 with concentrations of liquidcrystal monomers having the functional group of diacrylates being 0 wt%, 0.625 wt %, 1 wt %, and 2 wt % respectively. As shown in FIG. 12,under conditions of 0.625 wt % and 1 wt %, the LCDs show no surfacegliding. On the other hand, under conditions of 0 wt % and 2 wt %, theLCDs show surface gliding.

Table 2 lists the Experiments 4, 5, 6 and Comparative Example 2 with theLCD manufactured by adopting the method in the Second Example. Theexperiment is performed by comparing the difference in V-T curvesmeasured before and after aging of the display. The condition of agingis to drive the LCD for an hour under 40 Vpp. From the result, it isshown that the liquid crystal polymer film is formed by the liquidcrystal monomer having the functional group of diacrylates added in theliquid crystal mixture after the ultraviolet irradiation process in theExperiment 4 and the Experiment 5. The liquid crystal polymer film iscapable of reducing the percentage of V-T shift of the display. However,the liquid crystal monomer having the functional group of acrylateadopted in the Experiment 6 increases the percentage of V-T shift. It isthus shown that liquid crystal mixture containing liquid crystal monomerhaving the functional group of diacrylates can reduce the percentage ofV-T shift of the LCD effectively.

TABLE 2 Percentage of Percentage of liquid crystal liquid crystalmonomer having monomer having percentage the functional the functionalof group of diacrylates group of acrylate V-T shift Experiment 4 0.625 w% 0 wt % 0.011% Experiment 5 0.625 wt % 0 wt % 0.001% Experiment 6 0 wt% 0.625 wt % 13.170% Comparative 0 wt % 0 wt % 3.373% Example 2

Further, Table 3 lists the Example 4 and Comparative Example 2 whichadopt the LCD fabricated with the method shown in the Second Example. Itis thus illustrated that the liquid crystal polymer film formed by theliquid crystal mixture added with the liquid crystal monomer having thefunctional group of diacrylates is capable of enhancing the anchoringenergy of the LCD.

TABLE 3 Percentage of liquid crystal monomer having the functionalAnchoring group of diacrylates energy (J/m²) Experiment 4 0.625 wt %1.030 × 10⁻³ Comparative 0 wt % 2.505 × 10⁻⁴ Example 2

Third Example

An LCD of the Third Example is an LCD in an IPS mode, where the LCD isformed by using the method described in the Second Embodiment. That is,the first alignment material and the second alignment material arerespectively formed on the first substrate and the second substrate. Anon-contact alignment process is then performed. The two substrates areassembled subsequently, and the liquid crystal mixture is filledtherebetween. The foregoing non-contact alignment process adopts thephoto alignment process. Here, liquid crystal molecules in the adoptedliquid crystal mixtures are all ZOC-5084XX (manufactured by Chisso).Nevertheless, liquid crystal monomers used are compared in the followingthree experiments. Among these, Experiment 7 applies a liquid crystalmonomer RMM-256C having a functional group of diacrylates (manufacturedby Merck), and Experiment 8 adopts a liquid crystal monomer RMM-491having a functional group of diacrylates (manufactured by Merck).However, Experiment 9 uses a liquid crystal monomer UCL-001 having afunctional group of acrylate (manufactured by DIC). Moreover, a materialof an alignment film is RN-1349 (manufactured by Nissan). The liquidcrystal monomer having the functional group of diacrylates in theExperiments 7 and 8 and the liquid crystal monomer having the functionalgroup of acrylate in the Experiment 9 are irradiated by ultravioletlight (2 J/cm²) to polymerize, so that a liquid crystal polymer film isrespectively formed on the first alignment material and the secondalignment material.

Table 4 lists the Experiments 7, 8, 9 and Comparative Example 3 with theLCD manufactured by adopting the method in the Third Example. Theexperiment is performed by comparing the difference in V-T curvesmeasured before and after aging of the display. The condition of agingis to drive the LCD for an hour under 40 Vpp. From the result, it isshown that the liquid crystal polymer film is formed by the liquidcrystal monomer having the functional group of diacrylates added in theliquid crystal mixture after the ultraviolet irradiation process in theExperiment 7 and the Experiment 8. The liquid crystal polymer film iscapable of reducing the percentage of V-T shift of the display. However,the liquid crystal monomer having the functional group of acrylateadopted in the Experiment 9 increases the percentage of V-T shift. It isthus understood that liquid crystal mixture containing liquid crystalmonomer having the functional group of diacrylates can reduce thepercentage of V-T shift of the LCD effectively.

TABLE 4 Percentage of Percentage of liquid crystal liquid crystalmonomer having monomer having percentage the functional the functionalof group of diacrylates group of acrylate V-T shift Experiment 7 0.625wt % 0 wt % 0.971% Experiment 8 0.625 wt % 0 wt % 0.270% Experiment 9 0wt % 0.625 wt % 2.856% Comparative 0 wt % 0 wt % 2.197% Example 3

In summary, in the disclosure, the liquid crystal polymer layer isformed on the aligned surfaces of the substrates or the alignmentmaterial layers as alignment auxiliary layer, such that the anchoringenergy of alignment can be greatly increased so as to enhance displayquality of the LCD.

Additionally, in the disclosure, the formation of liquid crystal polymerlayer in the LCD enhances the anchoring energy of the LCD and improvesthe surface gliding and V-T curve shift, thereby enhancing opticalfeature of the LCD, such as reducing residual image and the like.

Although the disclosure has been described with reference to the aboveembodiments, it will be apparent to one of the ordinary skill in the artthat modifications to the described embodiment may be made withoutdeparting from the spirit of the disclosure. Accordingly, the scope ofthe disclosure will be defined by the attached claims not by the abovedetailed descriptions.

What is claimed is:
 1. A method of fabricating a liquid crystal display,the method comprising: providing a first substrate and a secondsubstrate; performing an alignment process respectively on a surface ofthe first substrate and a surface of the second substrate; preparing aliquid crystal mixture, wherein the liquid crystal mixture comprises aliquid crystal molecule and a liquid crystal monomer having a functionalgroup of diacrylates, and the liquid crystal monomer having thefunctional group of diacrylates occupies 0.01-2 wt % of the liquidcrystal mixture; assembling the first substrate and the second substrateand filling the liquid crystal mixture therebetween; and performing aprocessing procedure so that the liquid crystal monomer having thefunctional group of diacrylates in the liquid crystal mixture ispolymerized to respectively form a liquid crystal polymer film on thealigned surface of the first substrate and the aligned surface of thesecond substrate.
 2. The method of fabricating the liquid crystaldisplay as claimed in claim 1, wherein the liquid crystal monomer havingthe functional group of diacrylates occupies 0.01-1 wt % of the liquidcrystal mixture.
 3. The method of fabricating the liquid crystal displayas claimed in claim 1, wherein the liquid crystal monomer having thefunctional group of diacrylates occupies 0.25-1 wt % of the liquidcrystal mixture.
 4. The method of fabricating the liquid crystal displayas claimed in claim 1, wherein the surface of the first substrate andthe surface of the second substrate are respectively a conductive layeror an insulating layer.
 5. The method of fabricating the liquid crystaldisplay as claimed in claim 4, wherein the first substrate is an activedevice array substrate and the second substrate is a color filtersubstrate or a counter substrate.
 6. The method of fabricating theliquid crystal display as claimed in claim 4, wherein the conductivelayer on the surface of the first substrate comprises a pixel electrodeand a common electrode, and the surface of the second substrate is theinsulating layer.
 7. The method of fabricating the liquid crystaldisplay as claimed in claim 1, wherein the alignment process is acontact alignment process or a non-contact alignment process.
 8. Themethod of fabricating the liquid crystal display as claimed in claim 7,wherein the non-contact alignment process comprises a particle beamalignment process or a photo alignment process.
 9. The method offabricating the liquid crystal display as claimed in claim 1, whereinthe alignment process is a multi-domain alignment process.
 10. Themethod of fabricating the liquid crystal display as claimed in claim 1,wherein the processing procedure comprises an ultraviolet irradiationprocedure or a heating procedure.
 11. The method of fabricating theliquid crystal display as claimed in claim 1, wherein a method ofpreparing the liquid crystal mixture comprises mixing the liquid crystalmolecule and the liquid crystal monomer having the functional group ofdiacrylates and heating the mixture to dissolve in a liquid state, orusing a solvent to dissolve the liquid crystal molecule and the liquidcrystal monomer having the functional group of diacrylates into a liquidstate and then mixing the same.